Take a chill pill FF:
Perhaps if you'd posted the circumstances as background information in your original posting you might have avoided some of the irony of subsequent replies.
I was genuinely interested in a pressure active stall warner, having never heard of it.
It does however sound a bit like the 'wire and cork float' type of fuel gauge on some a/c types.
However I'm not about to get the books out every time there is noise on PPRuNe.
Safe (and fully powered) flying
Cusco
(aka Mr Smart *rse)